>^v 



TO 



MoNs. P. A. LATREILLE, 



Member of the Institute, of the Legion of Honour, Sfc. S^c. Professor at 



the Garden of Plants, 



WHOSE INVALUABLE AND UNRIVALLED WRITINGS 



HAVE CONTRIBUTED SO ESSENTIALLY TO THE ADVANCE- 

 MENT OF SCIENCE, 



THE PRESENT VOLUME 



IS DEDICATED, 



AS A SMALL BUT SINCERE TOKEN 



OF THE ESTEEM AND RESPECT OF 



THE AUTHOR. 



London, Dec. I, 1830. 



